Advanced Optoelectronic Technology, Inc.

National Yang Ming Chiao Tung University

Te-Wen Kuo

Teng-Ming Chen

Yu-Fen Chang

A lighting device with adjustable color temperature includes a power, a driver, and a plurality of branches. The power is electrically connected to the driver for supplying power to the driver. Each of the branches includes a light source and an adjustor connected in series. The adjustor controls the color temperature of the light source in a corresponding branch by adjusting the voltage through the corresponding branch.

Lighting device with adjustable color temperature

An LED unit includes an LED and an electrochromic element mounted on the LED. The LED includes a base, a light emitting die mounted on the base, a pair of leads electrically connected to the die and an encapsulant sealing the die. The encapsulant has a first area and a second area around the first area. The first area contains yellow phosphor therein, and the second area contains red phosphor therein. The electrochromic element has an opening through which the first area of the encapsulant is exposed. The second area of the encapsulant is covered by the electrochromic element. The electrochromic element can change its color when being electrified, thereby changing the color temperature of the light output from the LED unit.

LED unit having electrochromic element

The present invention relates to novel phosphors, which are represented by a formula of (AM)DOS, wherein x, A, M and D are defined the same as the specification. In addition, the present invention further provides a light-emitting device using the above novel phosphors.

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Hsinchu, Taiwan

Te-Wen Kuo